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/////////////////////////////////////////////////////////////////////// |
/////////////////////////////////////////////////////////////////////// |
4 |
//Includes |
//Includes |
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#include <pic18.h> |
#include <pic18.h> |
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#include <string.h> |
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#include "delay.h" |
#include "delay.h" |
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#include "i2c.h" |
#include "i2c.h" |
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#include "lcd.h" |
#include "lcd.h" |
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//Defines |
//Defines |
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#define TC74 0x9A /* I2C TC74 IC */ |
#define TC74 0x9A /* I2C TC74 IC */ |
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////////////// |
#define SLIP_END 192 |
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// Enums |
#define SLIP_ESC 219 |
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#define SLIP_ESCAPED_END 220 |
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#define SLIP_ESCAPED_ESC 221 |
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#define BUFFERLEN 16 |
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////////////////////////////////////////////////////////////////// |
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// Enumerations |
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enum SlipState{ |
enum SlipState{ |
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SlipNormal, |
SlipNormal, |
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SlipStopped |
SlipStopped |
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}; |
}; |
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enum BaudRates{ |
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Baud1200, |
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Baud2400, |
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Baud4800, |
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Baud9600, |
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Baud19200 |
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}; |
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enum Commands{ |
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CmdRead, |
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CmdWrite, |
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CmdAck, |
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CmdNAck |
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}; |
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enum Targets { |
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TLed3, //0 |
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TLed4, |
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TLed5, |
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TSwitch2, |
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TSwitch3, |
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TPotmeter, |
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TTemp, |
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TBaud = 10 |
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}; |
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////////////////////////////////////////////////////////////////// |
////////////////////////////////////////////////////////////////// |
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//Globale data |
//Globale data |
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// Alle globale variabler bruger "global_" som prefix |
// Alle globale variabler bruger "global_" som prefix |
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unsigned char global_comm_buffer[10]; |
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unsigned char global_comm_buffer[BUFFERLEN]; |
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unsigned char global_comm_length; |
unsigned char global_comm_length; |
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unsigned char global_comm_index; |
unsigned char global_comm_index; |
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bit global_comm_ready; |
bit global_comm_ready; |
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bit global_comm_recieving; |
bit global_comm_error; |
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unsigned char global_comm_slipstate; |
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unsigned char global_comm_currentrate; |
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unsigned char global_lcd_buffer[20]; |
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unsigned char global_lcd_index; |
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unsigned char global_comm_state; |
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bit global_led_0; |
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bit global_led_1; |
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bit global_led_2; |
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bit global_reset_baudrate; |
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char global_temp; |
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unsigned char global_potmeter_hi; |
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unsigned char global_potmeter_lo; |
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/////////////////////////////////////////////////////////////////// |
/////////////////////////////////////////////////////////////////// |
88 |
// Interrupt funktioner |
// Interrupt funktioner |
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void recieve_interrupt(void) |
void recieve_interrupt(void) |
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{ |
{ |
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unsigned char data = RCREG; |
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RB2 = !RB2; |
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switch (global_comm_slipstate) |
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{ |
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case SlipNormal: |
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if (data == SLIP_END) |
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{ |
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global_comm_ready = 1; |
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global_comm_slipstate = SlipStopped; |
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} |
103 |
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else if (data == SLIP_ESC) |
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{ |
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global_comm_slipstate = SlipEscaped; |
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} |
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else |
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global_comm_buffer[ global_comm_length++ ] = data; |
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break; |
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case SlipEscaped: |
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if (data == SLIP_ESCAPED_ESC) |
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{ |
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global_comm_buffer[ global_comm_length++ ] = SLIP_ESC; |
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global_comm_slipstate = SlipNormal; |
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} |
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else if (data ==SLIP_ESCAPED_END) |
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{ |
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global_comm_buffer[ global_comm_length++ ] = SLIP_END; |
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global_comm_slipstate = SlipNormal; |
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} |
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else |
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{ |
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global_comm_slipstate = SlipError; |
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} |
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case SlipError: |
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if (data == SLIP_END) |
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{ |
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global_comm_error = 1; |
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global_comm_slipstate = SlipStopped; |
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global_comm_ready = 1; |
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} |
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case SlipStopped: //vi var ikke klar til at modtage data |
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global_comm_error = 1; |
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} |
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} |
} |
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/* |
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void transmit_interrupt(void) |
void transmit_interrupt(void) |
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{ |
{ |
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RB2 = !RB2; |
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} |
} |
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*/ |
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void interrupt interrupt_handler(void) |
void interrupt interrupt_handler(void) |
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{ |
{ |
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recieve_interrupt(); |
recieve_interrupt(); |
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RCIF = 0; |
RCIF = 0; |
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} |
} |
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if (TXIF == 1) |
/*if (TXIF == 1) |
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{ |
{ |
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transmit_interrupt(); |
transmit_interrupt(); |
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TXIF = 0; |
TXIF = 0; |
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} |
} |
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*/ |
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} |
} |
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/////////////////////////////////////////////////////////////////// |
/////////////////////////////////////////////////////////////////// |
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// Alm funktioner |
// Slip funktioner |
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void slip_reset(void) |
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{ |
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global_comm_error = 0; |
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global_comm_slipstate = SlipNormal; |
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global_comm_ready = 0; |
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global_comm_length = 0; |
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memset(global_comm_buffer, 0, BUFFERLEN); |
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} |
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void slip_highlevel_protocol(void) |
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{ |
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unsigned char cmd,target,data; |
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cmd = global_comm_buffer[0] & 0x0F; |
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target = ( global_comm_buffer[0] >> 4 ) & 0x0F; |
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data = global_comm_buffer[1]; |
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if (cmd == CmdRead || cmd == CmdWrite) |
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{ |
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//sæt standart længde - da længden kun varierer ved læsning af potmeter |
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if (cmd == CmdRead) |
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global_comm_length = 2; |
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else |
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global_comm_length = 1; |
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switch(target) |
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{ |
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case TLed3: |
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if (cmd == CmdRead) |
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global_comm_buffer[1] = global_led_0; |
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else |
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global_led_0 = data; |
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break; |
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case TLed4: |
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if(cmd == CmdRead) |
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global_comm_buffer[1] = global_led_1; |
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else |
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global_led_1 = data; |
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break; |
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case TLed5: |
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if (cmd == CmdRead) |
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global_comm_buffer[1] = global_led_2; |
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else |
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global_led_2 = data; |
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break; |
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case TSwitch2: |
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if (cmd == CmdRead) |
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global_comm_buffer[1] = RA4; |
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else |
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global_comm_error = 1; |
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break; |
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case TSwitch3: |
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if (cmd == CmdRead) |
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global_comm_buffer[1] = RB0; |
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else |
218 |
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global_comm_error = 1; |
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break; |
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case TPotmeter: |
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if (cmd == CmdRead) |
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{ |
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global_comm_buffer[1] = global_potmeter_hi; |
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global_comm_buffer[2] = global_potmeter_lo; |
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global_comm_length = 3; |
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} |
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else |
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global_comm_error = 1; |
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break; |
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case TTemp: |
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if (cmd == CmdRead) |
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global_comm_buffer[1] = global_temp; |
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else |
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global_comm_error = 1; |
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break; |
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case TBaud: |
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if (cmd == CmdRead) |
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global_comm_error = 1; |
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else |
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{ |
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//we can only handle 1200,2400,9600,19200 |
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if (data == 0 || data == 1 || data == 3 || data == 4) |
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global_reset_baudrate = 1; |
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else |
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global_comm_error = 1; |
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} |
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break; |
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default: |
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global_comm_error = 1; |
250 |
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} |
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} |
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else //kommandoen var noget andet end read/write |
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{ |
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global_comm_error = 1; |
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} |
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if (global_comm_error == 1) //we saw an error |
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{ |
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global_comm_buffer[0] = CmdNAck | target<<4; |
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global_comm_length = 1; |
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} |
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else |
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{ |
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global_comm_buffer[0] = CmdAck | target<<4; //skriv acknowledge feltet |
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} |
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} |
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void slip_send_byte(char data) |
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{ |
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TXREG = data; |
273 |
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while (TRMT==0) ; |
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DelayUs(20); |
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} |
276 |
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void slip_send_response(void) |
278 |
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{ |
279 |
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int i; |
280 |
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for (i=0; i< global_comm_length;i++) |
281 |
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{ |
282 |
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if ( global_comm_buffer[i] == SLIP_ESC) |
283 |
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{ |
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slip_send_byte(SLIP_ESC); |
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slip_send_byte(SLIP_ESCAPED_ESC); |
286 |
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} |
287 |
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else if (global_comm_buffer[i] == SLIP_END) |
288 |
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{ |
289 |
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slip_send_byte(SLIP_ESC); |
290 |
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slip_send_byte(SLIP_ESCAPED_END); |
291 |
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} |
292 |
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else |
293 |
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{ |
294 |
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slip_send_byte( global_comm_buffer[i]); |
295 |
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} |
296 |
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} |
297 |
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298 |
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slip_send_byte(SLIP_END); |
299 |
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} |
300 |
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301 |
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/////////////////////////////////////////////////////////////////// |
302 |
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// Gennerelle funktioner |
303 |
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304 |
void interrupt_init(void) |
void interrupt_init(void) |
305 |
{ |
{ |
306 |
TXIE = 1; //Enable AUX TX interrupt - testes med TXIF; |
TXIE = 0; //Disable AUX TX interrupt - testes med TXIF; |
307 |
RCIE = 1; //Enable AUX Recieve interrupt - testes med RCIF; |
RCIE = 1; //Enable AUX Recieve interrupt - testes med RCIF; |
308 |
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309 |
IPEN = 0; // IPEN=Interrupt Priority ENable bit - her bruges ingen prioritet |
IPEN = 0; // IPEN=Interrupt Priority ENable bit - her bruges ingen prioritet |
347 |
// RCSTA2 = 0 No framing error |
// RCSTA2 = 0 No framing error |
348 |
// RCSTA1 = 0 Overrun error bit |
// RCSTA1 = 0 Overrun error bit |
349 |
// RCSTA0 = 0 9th bit */ |
// RCSTA0 = 0 9th bit */ |
350 |
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|
351 |
//config completed |
//config completed |
352 |
SPEN = 1; //Enable Serial port |
SPEN = 1; //Enable Serial port |
353 |
} |
} |
354 |
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355 |
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/* basic I/O ports */ |
356 |
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void io_init(void) |
357 |
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{ |
358 |
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TRISB3 = 0; //LED ports = output |
359 |
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TRISB2 = 0; |
360 |
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TRISB1 = 0; |
361 |
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362 |
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TRISB0 = 1; //Switch porte = input |
363 |
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TRISA0 = 1; |
364 |
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} |
365 |
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366 |
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void ad_init(void) |
367 |
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{ |
368 |
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// AD Conversion clock |
369 |
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ADCS0 = 0; |
370 |
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ADCS1 = 0; |
371 |
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ADCS2 = 0; |
372 |
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373 |
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//Select AN0/RA0 for AD source |
374 |
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CHS0=0; |
375 |
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CHS1=0; |
376 |
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CHS2=0; |
377 |
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378 |
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//Only AN0 is selected for AD and with Vdd/Vss as limits |
379 |
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PCFG0=0; |
380 |
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PCFG1=1; |
381 |
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PCFG2=1; |
382 |
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PCFG3=1; |
383 |
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384 |
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//Result is right justified |
385 |
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ADFM=1; |
386 |
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387 |
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//Fire up for A/D converter module |
388 |
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ADON=1; |
389 |
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} |
390 |
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391 |
void i2c_init(void) |
void i2c_init(void) |
392 |
{ |
{ |
393 |
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// I2C_MODULE hører hjemme i i2c.h |
394 |
#ifdef I2C_MODULE |
#ifdef I2C_MODULE |
395 |
SSPMode(MASTER_MODE); |
SSPMode(MASTER_MODE); |
396 |
SSPEN = 1; |
SSPEN = 1; |
423 |
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424 |
void main(void) |
void main(void) |
425 |
{ |
{ |
426 |
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char lcdbuf[20]; |
427 |
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int i; |
428 |
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429 |
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430 |
lcd_init(0); //init in 4-bit mode |
lcd_init(0); //init in 4-bit mode |
431 |
i2c_init(); |
i2c_init(); |
432 |
serial_init(); //9600 8N1 |
serial_init(); //9600 8N1 |
433 |
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ad_init(); |
434 |
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io_init(); |
435 |
interrupt_init(); |
interrupt_init(); |
436 |
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global_comm_length = 0; |
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global_comm_ready = 0; |
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437 |
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438 |
global_comm_state = SlipNormal; |
slip_reset(); //take SLIP FSM into normal state |
439 |
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global_comm_currentrate = Baud9600; //default baudrate = 9600 |
440 |
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global_reset_baudrate = 0; |
441 |
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|
442 |
// initialisation completed and we are ready to recieve commands - enable serial reception |
// initialisation completed and we are ready to recieve commands - enable serial reception |
443 |
CREN = 1; |
CREN = 1; |
444 |
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|
445 |
while (1) |
while (1) |
446 |
{ |
{ |
447 |
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if (global_comm_ready == 1) |
448 |
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{ |
449 |
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slip_highlevel_protocol(); //parse the slip frame recieved & generate response |
450 |
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slip_send_response(); |
451 |
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slip_reset(); |
452 |
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} |
453 |
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454 |
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if ( global_reset_baudrate == 1) |
455 |
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{ |
456 |
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} |
457 |
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458 |
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RB1 = global_led_0; |
459 |
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RB2 = global_led_1; |
460 |
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RB3 = global_led_2; |
461 |
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462 |
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global_temp = ReadTemp(); |
463 |
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464 |
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//potmeter |
465 |
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if (GODONE ==0 )//hvis A/D-conv er færdig |
466 |
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{ |
467 |
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468 |
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global_potmeter_hi = ADRESH;//gem AD resultat |
469 |
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global_potmeter_lo = ADRESL; |
470 |
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GODONE = 1; //start ny konverering |
471 |
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} |
472 |
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473 |
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474 |
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//just for fun - blink RB3 |
475 |
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// RB3 = !RB3; |
476 |
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// DelayMs(250); |
477 |
} |
} |
478 |
} |
} |
479 |
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